Oxygen in aquariums

[kazz]

I have a question about aquarium used as enclosure. CO2 has more weight than oxygen, it means a tank will fill with CO2 at a floor. A tank is sealed so it leads a snake to have small amount of oxygen to breath.
Why ppl don't consider that fact of CO2 weight ?

[Aaron_S]

Tanks aren't sealed, or shouldn't be.

[kazz]

Tanks aren't sealed, or shouldn't be.

I mean an aquarium is sealed besides a top. So CO2 fills a space inside.

[ReptiWorldWide]

I think it shouldn't really matter as long as there is good ventilation on top. Because although CO2 may weigh more than Oxygen, both of them don't weigh at all basically so i think fresh are should be constantly passing through (even if we cant feel it).

[Veronica]

Yeah, passive ventilation is plenty to keep everything circulated. My leopard gecko has never had an issue, and she lived in a top opening for many years

[kazz]

Perhaps I can answer my question myself. I think air ventilation is doing via heating for reptile. No matter it's a lamp or heat pad. Heat devices warm CO2 and it go upside of enclosure.